Macromol. Rapid Commun. 20/2014

Inadomi, Takumi; Ikeda, Shogo; Okumura, Yasushi; Kikuchi, Hirotsugu; Miyamoto, Nobuyoshi

doi:10.1002/marc.201470074

Cited by 8 publications

(10 citation statements)

References 0 publications

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“…Anisotropy is generally introduced to transformer hydrogels by the addition of fibrils or fibers, nano/macroparticles and sheets, directionally aligned fibrous hydrogel composites, and molecular alignment of polymer chains . Gladman et al developed a hydrogel ink for 3D printing by combining a thermoresponsive cross‐linked acrylamide with stiff cellulose fibrils embedded in it.…”

Section: Principlesmentioning

confidence: 99%

Transformer Hydrogels: A Review

Erol

Pantula

Liu

et al. 2019

Adv Materials Technologies

235

211

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Hydrogels, which are hydrophilic soft porous networks, are an important class of materials of broad relevance to bioanalytical chemistry, soft‐robotics, drug delivery, and regenerative medicine. Transformer hydrogels are micro‐ and mesostructured hydrogels that display a dramatic transformation of shape, form, or dimension with associated changes in function, due to engineered local variations such as in swelling or stiffness, in response to external controls or environmental stimuli. This review describes principles that can be utilized to fabricate transformer hydrogels such as by layering, patterning, or generating anisotropy, and gradients. Transformer hydrogels are classified based on their responsivity to different stimuli such as temperature, electromagnetic fields, chemicals, and biomolecules. A survey of the current research progress suggests applications of transformer hydrogels in biomimetics, soft robotics, microfluidics, tissue engineering, drug delivery, surgery, and biomedical engineering.

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Section: Principlesmentioning

confidence: 99%

Transformer Hydrogels: A Review

Erol

Pantula

Liu

et al. 2019

Adv Materials Technologies

235

211

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show abstract

“…[13] Another interesting approach is that 2D nanocolloids can mix well with polymer colloids if the solvent can be shared. [14][15][16] A mixture of conventional molecular LCs and polymers has also been intensively studied, in which the role of the polymer in a conventional LC mixture is generally irreversible polymerization to freeze the LC assembly structure. [17] Similar strategy has been demonstrated in polymer-nanocomposite materials to freeze the nanoparticle alignment, in which the polymerized nanocomposite exhibits unique mechanical Multiresponsive functional materials that respond to more than one external stimulus are promising for novel photonic, electronic, and biomedical applications.…”

Section: Doi: 101002/smll202203551mentioning

confidence: 99%

“…[1][2][3] Rich mesophases, such as nematic, columnar, chiral, and smectic phases, have been reported in various 2D nanocolloids, properties. [14,15] However, composite materials of polymers and nanocolloids can be designed differently to enrich the self-assembly properties of nanocolloids while preserving the intrinsic phase properties of the polymers and nanocolloids. [16] Polymer colloid, a major soft material, has unique properties, such as self-assembly, formation of periodic nanostructures, photonic crystals, and sol-gel transition.…”

Section: Introductionmentioning

confidence: 99%

Multiresponsive Polymer Nanocomposite Liquid Crystals Having Heterogeneous Phase Transitions for Battery‐Free Temperature Maintenance Indicators

Priyadharshana

Park

Hong

2022

Small

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Multiresponsive functional materials that respond to more than one external stimulus are promising for novel photonic, electronic, and biomedical applications. However, the design or synthesis of new multiresponsive materials is challenging. Here, this work reports a facile method to prepare a multiresponsive colloidal material by mixing a liquid‐crystalline 2D nanocolloid and a functional polymer colloid. For this purpose, electrically sensitive exfoliated α‐ZrP 2D nanocolloids and thermosensitive block copolymer colloids that are dispersed well in water are mixed. In the liquid‐crystalline nanocomposite, nematic, antinematic, or isotropic assemblies of α‐ZrP, nanoparticles can be electrically and selectively obtained by applying electric fields with different frequencies; furthermore, their rheology is thermally and reversibly controlled through thesol–gel–sol transition. The nanocomposite exhibits a solid gel phase within a predesigned gel temperature range and a liquid sol phase outside this range. These properties facilitate the design of a simple display device in which information can be electrically written and thermally stabilized or erased, and using the device, a battery‐free temperature maintenance indication function is demonstrated. The proposed polymer nanocomposite method can enrich the physical properties of 2D nanocolloidal liquid crystals and create new opportunities for eco‐friendly, reusable, battery‐free electro‐optical devices.

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“…[9][10][11][12][13] Based on the structural ordering of the LC phases, monolithic structures have been prepared from these anisotropic particles through immobilization of LC structures into solid states via embedding or replication into matrixes. [14][15][16][17][18] We have investigated oxide nanosheets in colloidal LCs as the building blocks for the macroscopic hierarchical structures of inorganic polymers. 11 12 19-22 The nanosheets are highly anisotropic mesogens of around 1 nm thickness and micrometers of lateral length prepared by exfoliation of layered crystals, and thus the nanosheet LCs are characterized by stable LC phases.…”

Section: Introductionmentioning

confidence: 99%

Flow-Induced Assembly of Colloidal Liquid Crystalline Nanosheets Toward Unidirectional Macroscopic Structures

Nono¹,

Mouri²,

Nakata³

et al. 2016

j nanosci nanotechnol

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Multiscale structures of anisotropic nanoparticles up to macroscopic scales are important in order to produce practical materials through nanotechnology. As an example of such structures, hierarchical organization of colloidal liquid crystals of niobium oxide nanosheets yields stripe textures observable by naked eyes. The stripes are generated by the growth of liquid crystalline domains (tactoids) and the alignment of the tactoids under an electric field and gravity applied in the directions orthogonal to each other. The nanosheets forming the tactoids are unidirectionally aligned along the flow induced by gravity, and the aligned tactoids are stretched to be connected each other to form the stripes. Time evolution of the stripes indicates that they are generated during the settlement of the nanosheets. The nanosheets are debundled with the settlement, and thus the stripes are gradually degenerated during the settlement. Larger tactoids cause faster nanosheet settlement and stripe degeneration. The electric field applied orthogonally to gravity has roles of pinning the nanosheets to slow down their settlement and retains the stripes for several hours.

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Macromol. Rapid Commun. 20/2014

Cited by 8 publications

References 0 publications

Transformer Hydrogels: A Review

Transformer Hydrogels: A Review

Multiresponsive Polymer Nanocomposite Liquid Crystals Having Heterogeneous Phase Transitions for Battery‐Free Temperature Maintenance Indicators

Flow-Induced Assembly of Colloidal Liquid Crystalline Nanosheets Toward Unidirectional Macroscopic Structures

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